Improvement in oil-well pumps



M. LYTLE. Oil-Well Pumps.

No. 206,956. Patented Aug.13,1878.

[72 van 074 4% N. PETERS. PHOTO-LITHQGRAPNER, WASHINGTON. D C4 UNITED STATE-s PATENT OEErcE.

MURDICK LYTLE, OFA OIL CITY, PENNSYLVANIA.

IMPROVEMENT IN OIL-WELL PUMPS.

Specification forming part of` Leiters Patent N0. 206,956, dated August 13, LQTS; application tiled July 16, 1875?.

To all whom it may concern.-

Be it known that l', MURDICK LYTLE, of Oil City, in the county of Venango and State of Pennsylvania, have invented a new and useful Improvement in Oil-Well Pumps, which improvement is fully set forth in the following specification and aceompanyin g drawings, in which latter- Figure l is a vertical central section of the said pump, and Fig. 2 an enlarged vertical section. of the double piston used therein.

The nature of my invention consists in certain constructions, combinations, and arrangement of parts, hereinafter described and specitlcally claimed, whereby an oil-well pump is produced which is adapted for pumping oil and washing the walls of the well.

The object of my invention is to provide a pump which is simple in its construction, and which, in its upstroke, is capable of lifting oil from wells and discharging the major portion into proper receivers, and in its downstroke violently force back into the well in a lateral direction the minor portion of oil thus lifted, and thereby prevent the walls of the well and the holes in the tube from becoming` coated with paraftine.

Another object of my invention is to insure a backward movement and lateral discharge of the oil, and at the same time provide for an agitation of the sediment and parafne by suction through the foot-valve ofthe pump at such times when the bottom of the pump is not closed tight, andthe lateral holes are notmade large enough to be wholly depended upon for the influx and efiux of the oil.

In the accompanying drawings, A represents a pump-barrel of ordinary construction, and B a smaller barrel, forming a continuation of the barrel A by being fastened to the lower end of the same. C indicates a case for a footvalve, and is fastened to the lower end of the barrel B. The barrel A is provided with a hollow piston, D, which has an upper eXtension, d, with a' valve-chamber, dl, and side openings, d2. Within the valve-chamber all an ordinary valve, E, is properly seated over a contracted opening or valve-seat, e, at the top of the piston proper, and over its central passage, E.

To the top of the extension d a pump-rod, F, is suitably secured, and a second pump-rod,

G, is fastened to the lower part of a lower extension, g, of the piston l). Into this lower extension the central passage, E', ot' the piston is extended down to its bottoni, near which it is provided with side openings, g.

'Ihe piston D is provided with suitable packing f. The extensions d and g are of smaller diameter than the piston, in order to give ac cess from the barrel A to their side openings, cl2 and g', as will be hereinafter explained.

The pump-rod G extends down into the smaller barrel B, and there is provided with a piston, H. The piston H has an upper extension, h, to which the rod Gr is fastened. A central passage, hl, is made through the pis ton, and a valve-chamber, h2, in the extension h, the latter being provided with a valve, It, which is seated over the passage h* in a suitable manner. The lower part of the extension h is provided with side openings, h4. The extension h is of smaller diameter than the bore of the barrel B, so as to allow room for the oil which enters the barrel from the openings h4. The piston H is provided with suitable packing, h5. The case C has a foot-valve, c', seated over the suction-hole c at the bottom, and the barrelB is provided with openings b in all directions below the range of the piston H.

Operation: When the oil in the well is found to be sufficiently high over the openings b, which can be easily ascertained by a few strokes of the pump, the pump is regularly set in operation. The upstroke of the rod F causes the pistons D and H to ascend in the barrels A and B, the unequal diameters of which cause a steady increase of the capacity of the space between the two pistons, for which increase the lifting capacity of the lower smaller piston, H, does not furnish a sufficient supply. This deficiency creates a vacuum and suction between the two pistons,

the result of which is, that the oilr belowth'e piston H enters the passage h, lifts the valve h3, and, through the openings It, ent rsjtlle. space between the two pistons. At time the oil in the well enters ,their y. through the openings b and c, liftingthev L c', and keeping the space below thepiston Hf* lled. The downstroke offth'e pistonsD and H has the effect to diminish the space between them in the same degree the upstrokg/lfas increased it. This degree of capacity@ -uses the alve oil within the said space to force its way through the passage E of the piston D, lift the valve E, and pass through the openings d2 into the room above the said piston. The amount of oil thus forced above the piston D is equal to the difference of the lifting capacity of the two pistons. The oil below the piston II is, by the downstroke of the saine, forced through the holes b in so many powerful jets, which agitate the oil in the well, and strike the walls 0f the well with a force suiicient to wash oi' all solid formations of paraftine, which, if left undisturbed, would close up the suppl y-channels of the well.

1t will be seen that the foot-valve e and opening c' could be omitted and the barrel B closed at the bottom without changing the principle ot my invention; but by using` the said valve the agitation of the oil is extended downward by means of the suction of the pump, and

the more solid parts of the parafiine are easily drawn into the pump, and prevent-ed from y clogging the openings b during;` the up stroke l of the pistons, and thus a gradual accumulation of sediment in the bottom of the well is prevented.

What I claim as new is- 1. The combination of the barrels A B, of different diameters, and the pistons D II, substantially as and for the purpose set forth.

2. The hollow piston D, having open extensions d g, and a valve, E, in combination with the hollow piston Il, having an open extension, h, and valve h3, substantially as and for the purpose set forth.

3. The combination of the pistons D H, barrels A D, of different diameters, foot-valve c, and side openin gs, b, whereby at the downstroke of the pistons oil is forced radially from the barrel B, substantially as and for the purpose set forth.

MURDICI( LYTLE.

\\'itnesses:

B. F. JACOBS, (momma Ross. 

